If \( \frac{(n+6)!-(n+5)!}{(n+4)!}=196 \), what is the value of (n)?

Correct answer: 9

Using \((n+6)!=(n+6)(n+5)!\), the numerator becomes \((n+5)![(n+6)-1]=(n+5)(n+5)!\). Thus, the given expression equals \((n+5)^2\). Hence \((n+5)^2=196=14^2\). Since \(n+4\) must be a non-negative integer for the factorials to be defined, \(n+5=14\), not \(-14\). Therefore, \(n=9\). Substituting 8 would give \(169\), not 196. Exam tip: In factorial subtraction, factor out the smaller common factorial first.